On the nature of the cool component of MWC 560

Details On the nature of the cool component of MWC 560 On the nature of the cool component of MWC 560

2006-11-27

arxiv.org/abs/astro-ph/0611815v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figues, AA accepted

Scientific paper

MWC 560 (V694 Mon) is one of the most enigmatic symbiotic system with a very active accretion-powered hot component. Such activity can be supported only by a luminous asymptotic giant branch star, i.e. a Mira or SR variable, with a high mass-loss rate. It is also a very unusual jet source because the jet axis lies practically parallel to the line of sight. The aims of our study are the determination of the evolutionary status of the cool component of MWC 560. Our methods involve analysis of near-IR JHKL and optical light curves. The cool component of MWC 560 pulsates with a period of ~340 days, and it is probably a red SR variable on the thermally pulsing AGB. The high mass-loss rate expected for such a star is sufficient to power the observed activity of the hot companion.

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